<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">

    <title>猜数字游戏</title>

    <style>
        html {
            font-family: sans-serif
        }

        body {
            width: 50%;
            max-width: 800px;
            min-width: 480px;
            margin: 0 auto
        }

        .lastResult {
            color: white;
            padding: 3px
        }
    </style>
</head>

<body>
<h1>猜数字游戏</h1>

<p>我刚才随机选定了一个100以内的自然数。看你能否在 10 次以内猜中它。每次我都会告诉你所猜的结果是高了还是低了。</p>

<div class="form">
    <label for="guessField">请猜数: </label>
    <input type="text" id="guessField" class="guessField">
    <input type="submit" value="确定" class="guessSubmit">
</div>

<div class="resultParas">
    <p class="guesses"></p>
    <p class="lastResult"></p>
    <p class="lowOrHi"></p>
</div>

<script>
    // 开始编写 JavaScript 代码
    var randomNumber = Math.floor(Math.random() * 100) + 1;

    const guesses = document.querySelector('.guesses');
    const lastResult = document.querySelector('.lastResult');
    const lowOrHi = document.querySelector('.lowOrHi');

    const guessSubmit = document.querySelector('.guessSubmit');
    const guessField = document.querySelector('.guessField');

    var guessCount = 1;
    var resetButton;

    function checkGuess() {
        var userGuess = Number(guessField.value);
        if (guessCount === 1) {
            guesses.textContent = '上次猜的数：';
        }
        guesses.textContent += userGuess + ' ';

        if (userGuess === randomNumber) {
            lastResult.textContent = '恭喜你！猜对了';
            lastResult.style.backgroundColor = 'green';
            lowOrHi.textContent = '';
            setGameOver();
        } else if (guessCount === 10) {
            lastResult.textContent = '!!!GAME OVER!!!';
            setGameOver();
        } else {
            lastResult.textContent = '你猜错了！';
            lastResult.style.backgroundColor = 'red';
            if (userGuess < randomNumber) {
                lowOrHi.textContent = '你猜低了！';
            } else if (userGuess > randomNumber) {
                lowOrHi.textContent = '你猜高了';
            }
        }

        guessCount++;
        guessField.value = '';
        guessField.focus();
    }

    guessSubmit.addEventListener('click', checkGuess);

    function setGameOver() {
        guessField.disabled = true;
        guessSubmit.disabled = true;
        resetButton = document.createElement('button');
        resetButton.textContent = '开始新游戏';
        document.body.appendChild(resetButton);
        resetButton.addEventListener('click', resetGame);
    }
    function resetGame() {
      guessCount = 1;
    
      const resetParas = document.querySelectorAll('.resultParas p');
      for (var i = 0 ; i < resetParas.length; i++) {
        resetParas[i].textContent = '';
  }

  resetButton.parentNode.removeChild(resetButton);

  guessField.disabled = false;
  guessSubmit.disabled = false;
  guessField.value = '';
  guessField.focus();

  lastResult.style.backgroundColor = 'white';

  randomNumber = Math.floor(Math.random() * 100) + 1;
}
</script>
</body>
</html>